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You can create a dropped, or suspended, ceiling by specifying its structure in the Ceiling Finish Definition dialog either for a room or the defaults for a floor.
16 - Ceilings
69 - Ceiling Basics
5521 - Sloped Soffits
312 - Creating a Coffered Ceiling with Recessed Backlit Panel
313 - Creating a Coffered Ceiling with Multiple Recessed Panels
64 - Using the Shelf Ceiling Room Structure setting
35 - Interior Soffits
311 - Drawing a Suspended Ceiling with Grid and Tile
10149 - Where to draw a custom ceiling plane - inside or outside of the room's wall?
6111 - Ceiling options, trey ceiling, custom shed ceiling – Grandview Build Project
6080 - Ceiling Options for a Master Bedroom Breckenridge Home Design
309 - Drawing Vaulted and Curved Ceilings
1935 - Project: Five-12 Kitchen Ceiling Options
1936 - Project: Five-12 Dining Room Octagon Ceiling